nutrient
Menaquinone-7 (MK-7)
A specific menaquinone form of vitamin K associated with some fermented foods and supplements.
Educational draft · Human scientific and editorial review pending. About review status
MK-7 has a longer side chain than MK-4. Food source, formulation and dose are separate details in a product record.
How it works
What the form means
MK-7 is a menaquinone form with a seven-isoprenoid side chain. It is chemically distinct from phylloquinone and MK-4.
Forms
Menaquinone-7 (MK-7) is a form of Vitamin K.
Menaquinone-7 (MK-7) is a named chemical form within its parent vitamin family.
Evidence: Established · Source checked 2026-09-05 · Sources: NIH Office of Dietary Supplements: Vitamin K: Fact Sheet for Health Professionals
Worth knowing
A fermented-food and supplement form. MK-7 is a named menaquinone associated with some fermented foods and supplements. Natto, a fermented soybean food, is a particularly rich source.
A closer look
Longer persistence is not the same as superiority
One study summarized by NIH ODS found MK-7 had a longer half-life than phytonadione, a synthetic K1 form. Data comparing the bioavailability and outcomes of different vitamin K forms remain limited, so persistence in blood does not establish a general health advantage.
References
Source-checked local draft.
Human editorial review pending.